I am sorry to hear of your situation.
What is it that you are wanting? You say that you are hurt and angry and want nothing more to do with him, but I'm sensing and feeling that isn't really what you are desiring here?
If you just want to get past the hurt as you say in your post, then I suggest you give yourself a season to cry and let the hurt out. You can't simply turn it off and deny it. If you try, it is my opinion that it'll just linger and build up and eat at you and poison your next relationship (and the one after that and the one after that and the one after that).
If you really want him back, then get the book Love Must Be Tough by Dr. James Dobson. He has to first get rid of that woman, sleeping with her or not (and I wouldn't believe for a moment that he isn't). And that choice has to come from him, not from you insisting on it. Until then, I say its the cold shoulder, no matter how much you really want him back. Anything less than that and you will be living a lie. He will be checked out emotionally.
Remember, we men do some really stupid things and unfortunately, we do them all too often. And sometimes we really hurt the woman that mean the most to us. And every once in a while (maybe not that often), we wake up and realize it and we would give the world to show those woman how sincere we are. Sometimes the best marriages follow the worst of circumstances. But it has to start with him. You can't make those changes for him.
I like this particular article, especially the section where it talks about new and improved marriages further down in it:
http://www.journeythroughdivorce.com/200...riage-problems/These are my opinions and are in no way professional. I am the product of 3 failed marriages and so my advice may be completely worthless. Take it for what its worth.